/Engine/Source/Runtime/Engine/Public/LevelInstance/LevelInstanceSubsystem.h
void ForEachActorInLevelInstance ( const [ILevelInstanceInterface](API\Runtime\Engine\LevelInstance\ILevelInstanceInterface) * LevelInstance, [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< bool([AActor](API\Runtime\Engine\GameFramework\AActor) *LevelActor)> Operation ) const